JH—3型病房对讲系统适用于病房、办公室等多种场合。该系统小型轻便。双方都可主动要求通话。不需要转换开关或复杂的延时线路,就可实现自由送话和受话。一、系统原理整机除分离式的送话和受话部分外,主要有功率放大器与稳压电源。其电路如下图所示。当 K_1接通时,变压器 B_1次级输出交流17伏电压,经桥式全波整流器 D_1整流,C_1、 JH-3 ward intercom system is suitable for wards, offices and other occasions. The system is compact and lightweight. Both parties can take the initiative to request a call. No need to change the switch or complex delay line, you can send and receive free speech. First, the system principle In addition to separation of the whole machine send and receive part, the main power amplifier and power supply. The circuit shown below. When K_1 is turned on, the transformer B_1 secondary output AC 17 volts, the bridge full-wave rectifier D_1 rectifier, C_1,